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Induction of IFN- β through both TLR-3- and RIG-I-mediated signaling pathways in canine respiratory epithelial cells infected with H3N2 canine influenza virus
In this study, we aimed to determine the signaling pathways leading to the induction of IFN-β in a canine respiratory epithelial cell line (i.e., KU-CBE) infected with the H3N2 subtype of CIV. Small interfering RNAs (siRNAs) specific to pattern recognition receptors (PRRs) and transcription factors were used to block the IFN-β-induction signals in H3N2 CIV-infected KU-CBE cells. Among the PRRs, only the TLR3 and RIG-I expression levels significantly (P < 0.001) increased in CIV-infected cells. Following transfection with siRNA specific to TLR3 (siTLR3) or RIG-I (siRIG-I), the mRNA expression levels of IFN-β significa...
Source: Journal of Microbiology and Biotechnology - June 8, 2021 Category: Biotechnology Authors: Woo-Jung Park Sang-Hoon Han Dong-Hwi Kim Young-Jo Song Joong-Bok Lee Seung-Yong Park Chang-Seon Song Sang-Won Lee In-Soo Choi Source Type: research

Hepatitis B virus DNA polymerase displays an anti-apoptotic effect by interacting with elongation factor 1-alpha2 in hepatoma cells.
In this study, we aimed at investigating the impact of HBV Pol on host cellular processes, mainly apoptosis, and the underlying mechanisms. We showed a marked reduction in apoptotic rates in the HBV Pol-expressed HepG2 cells compared to controls. Moreover, a series of assays-i.e. yeast two-hybrid, GST pull-down, co-immunoprecipitation, and confocal laser scanning microscopy-identified the host factor eEF1A2 to be associated with HBV Pol. Furthermore, knockdown of the eEF1A2 gene by siRNA abrogated the HBV Pol-mediated anti-apoptotic effect with apoptosis induced by endoplasmatic reticulum (ER) stress inducer thapsigargin (...
Source: Journal of Microbiology and Biotechnology - October 23, 2020 Category: Biotechnology Authors: Niu X, Nong S, Gong J, Zhang X, Tang H, Zhou T, Li W Tags: J Microbiol Biotechnol Source Type: research

Dendrobium moniliforme stem extract inhibits lipoteichoic acid-induced inflammatory responses by upregulation of heme oxygenase-1.
In this study, we investigated anti-inflammatory effects of the aqueous extract of D. moniliforme stems (DM) in response to lipoteichoic acid (LTA), a major constituent of the cell wall of Gram-positive bacteria. DM inhibited LTA-induced expression of a pro-inflammatory mediator inducible nitric oxide synthase (iNOS) in the murine macrophages. And DM induced expression of heme oxygenase-1 (HO-1) at the transcriptional level. Conversely, the knockdown of HO-1 expression by siRNA markedly reversed the inhibitory effects of DM on LTA-induced iNOS expression. We also demonstrated that nuclear translocation of Nrf2 was increase...
Source: Journal of Microbiology and Biotechnology - July 31, 2018 Category: Biotechnology Authors: Lee YJ, Kim JH, Kim Y Tags: J Microbiol Biotechnol Source Type: research

VEGF siRNA delivery by a cancer-specific cell-penetrating peptide.
In this study, we investigated the efficacy of the cancer-specific CPP carrier BR2 to specifically transport siRNA to cancer-target cells. Our results showed that BR2 formed a complex with anti-vascular endothelial growth factor siRNA (siVEGF) that exhibited the appropriate size and surface charge for in vivo treatment. Additionally, the BR2-VEGF siRNA complex exhibited significant serum stability and high levels of gene-silencing effects in vitro. Moreover, the transfection efficiency of the complex into a cancer cell line was higher than that observed in non-cancer cell lines, resulting in downregulated intracellular VEG...
Source: Journal of Microbiology and Biotechnology - January 11, 2018 Category: Biotechnology Authors: Lee YW, Hwang YE, Lee JY, Sohn JH, Sung BH, Kim SC Tags: J Microbiol Biotechnol Source Type: research

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